Australian rocker Orianthi, whose single "According to You" is steadily climbing the U.S. charts (it's No. 17 on the Billboard Hot 100), will be the guest performer on next week's elimination episode, Idol Tracker has learned. 

You may recall seeing the guitar virtuoso all over Michael Jackson's "This Is It" documentary — she was his touring guitar player — but this 24-year-old Adelaide native actually got her break by backing Carrie Underwood at the 2009 Grammy Awards (check out the performance of "Last Name" below).

Orianthi, who is managed by 19 Entertainment, also recently joined Mary J. Blige, "Idol" judge Randy Jackson, drummer Travis Barker and her personal Idol, Steve Vai, to record a cover of Led Zeppelin's "Stairway to Heaven." Read all about it here, and tune in next week to witness Orianthi's killer licks for yourself.

Carrie Underwood and Orianthi – "Last Name" (Live)
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– Shirley Halperin

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Photo credit: Meeno